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Q.

A 2 m high person is holding a 25 kg trunk on his head and is standing at a roadway’s bus-terminus. How much work is done by the person?


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a

0 J

b

50 J

c

25 J

d

500 J 

answer is A.

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Detailed Solution

The 2 m high person who is holding a 25 kg trunk does not work standing at the bus-terminus.
Work done is calculated by the formula,
W=F × s
Here,
F= Force is exerted by the man on the trunk.
s= Displacement of the trunk in the direction of applied force.
Since there is no displacement. S becomes 0, then
W=F×0
    =0
Work done becomes 0.
 
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